Re: [TenTec] Triton IV with digital modes

[jim <jim@itristar.com>]

I question whether the Triton's stable enough for sliver narrow PSK, but 
it sounds like
you're driving the Triton so hard that the supply is nervously 
approaching the current limit
knee.
It  might become unstable enough to cause frequency modulation of the 
transmitter. If there is a
radical DC instability, any dampening caps or voltage amplifier 
circuitry between the meter
and VSWR detector might be cycling and holding up enough voltage across 
the meter
coil to cause the erratic deflection.
If you are running the AFSK signal into the mic jack, set the drive up 
to the normal SSB mode
setting, then regulate the transmitter to about 25W by adjusting the 
COMPUTER audio level out.
If you can't get the computer audio level output down low enough to 
properly drive
the transmitter, you may have to stick a 10dB pad between the computer 
out and mic in,
as the computer level will often be significantly higher and too low an 
impedance than what
the transmitter would like to see to develop PEP. A 10:1 T-pad should 
take care of both, and
help produce distortion free AFSK sigs.  Effective PSK RF power levels 
are typically between
QRP to 30W.
Jim WA9Z


Louis Ciotti (KC2RVD) wrote:
> I have been using my Triton IV with PSK31 and RTTY over the past few weeks,
> and occasionally something odd happens.
>
>  
>
> I tun up the radio/antenna for about 1:1 using the lock position.  When I go
> to transmit using rtty/psk31 I will get a very high SWR reading on the
> Triton meter, and I get a weird buzzing noise coming from the 262G power
> supply.  I think the rig may be going into oscillation, but have no way to
> verify this.  Anyone else experience this??  I have been able to make some
> digital contact with good signal reports, but it this is with the drive
> turned way down.  
>
> _______________________________________________
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>
>
>
>   

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